(31669) 1999 JT6

is an Earth-crossing asteroid belonging to the Apollo family of asteroids which also crosses the orbit of Mars. 1999 JT6 is the asteroid's temporary discovery name. It has now been assigned a permanent number from the Minor Planet Center indicating that its orbit has been confirmed, but has not been assigned a name. Only a small fraction of asteroids have been named.
It has an Earth minimum orbit intersection distance of 0.00354 AU, which is close enough to classify it as a potentially hazardous asteroid. It will make a close approach to Earth on 14 December 2076 at 0.0260 AU and an even closer approach to the minor planet Ceres on 16 Feb 2084 at 0.0171 AU.